The next evolution in wireless networking holds promises of self-driving cars and movies that download in the blink of an eye. 5G is big at this year's Mobile World Congress, but don't expect it until 2020.

Feeling insecure? Sikur, part of Brazilian security firm Ciberbras, hopes businesses will go for its locked-down phone with encrypted-communication abilities. Here's a Nexus 5-based prototype it showed at Mobile World Congress.